su·per·hard
| \ ˌsü-pər-ˈhärd
\
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Definition of superhard
: extremely hard
One way to achieve such a high pressure … is to squeeze a sample between two superhard surfaces.— William J. Nellis
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“Superhard.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/superhard. Accessed 17 Apr. 2021.
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Time Traveler for superhard
The first known use of superhard was in 1891
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